Thanks for the suggestions Michel, I reverted to the version from sourceforge, but this time I built my own 2.4.3-12 kernel, and installed util-linux and crypto as modules, things went much better with a 'fresh' kernel, and it all works ok (after several rebuilds of the kernel when I got things wrong). The patch for util-linux was the wrong version, but seemed to cope OK (2.11l patched by a 2.11b patch) with only a failure to update a documentation file.. Crypto now works fine, and I shall persue trying to get the fixed block size working, so I can write it to a CD. Thanks, Paul Hilton _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/